I use the Google overlay to try and make the route prototype. The over lay is sometimes "foggy" though and you can not see things very well. I got a second monitor and put Google Earth up on it so I can see better as the data is better. The overlay is actually using Google Maps and not earth. But to my demise I discovered every time I clicked on the second monitor to move around, TS would minimize on the main monitor. Aaaaargh!!! Looking in the graphics settings of TS2015 I see there is a new option, a borderless window. My new monitor is up to 1920 x 1080 and you can have a window that size and borderless. Now the second monitor can be clicked on and TS does not minimize.
Also Google Earth has been updating things. I have 9/28/2014 data for where I am working now, other parts are 2012 though and I notice a slight offset in the data. Some places it is more than slight.